It sounds like the problem is more likely the signal coming into the PVR. Torrents can overload the HH2000 - see my recommendation in this thread and try that first.
If you don't use torrents, then I would investigate the connection to the PVR. Ethernet cable connected to the RJ45 jack is the most reliable. Coax cable can sometimes have flaky connections, but is usually OK if the cabling hasn't been changed since Bell installed the system. Adding splitters or moving any of the boxes can affect everything else connected by coax if not done properly.
If the PVR is wireless, then there may be intermittent problems with the Wi-Fi signal either caused by outside interference or the distance from the PVR to the HH2000.